Slashdot is powered by your submissions, so send in your scoop

 



Forgot your password?
typodupeerror
×

Comment Uh... summary? (Score 5, Insightful) 172

Article:
The operator of the crippled Fukushima Daiichi nuclear plant said it is studying whether the facility's reactors were damaged in the March 11 earthquake even before the massive tsunami that followed cut off power and sent the reactors into crisis.
Kyodo news agency quoted an unnamed source at the utility on Sunday as saying that the No. 1 reactor might have suffered structural damage in the earthquake that caused a release of radiation separate from the tsunami.
Summary:
Apparently, the earthquake had caused a crack in the containment vessel.

I'm not sure how the summary writer came to that conclusion... Shouldn't we wait for an actual report/finding before stating that?

Comment Port cities? (Score 3, Interesting) 125

The companies used for this fraud include the name of a Chinese port city in their official name. These cities
include: Raohe, Fuyuan, Jixi City, Xunke, Tongjiang, and Dongning.

Odd that they'd use the term "port city", as these don't sound like major transportation hubs. What's interesting is that all these places they've named are actually places on or near the border of Russia and China, in Heilongjiang Province.

Comment Re:please, enough horseshit (Score 2) 411

I don't know where New Scientist got their 1490 number, but the IAEA report on Chernobyl (http://www-pub.iaea.org/MTCD/publications/PDF/Pub1239_web.pdf) cited by Wikipedia gives an upper tier of 1480+ kBq/m^2 of cesium-137, except that 3100 km^2 of land in Russia, Ukraine and Belarus had at least that level of contamination. If you look at the total area at 555+ kBq/m^2 of cesium-137, you get 10300 km^2 of land which had at least that level of contamination. You'd need a circle with a radius of ~57 km to contain that much land.

Since 18 March, MEXT has repeatedly found caesium levels above 550 kBq/m2 in an area some 45 kilometres wide lying 30 to 50 kilometres north-west of the plant.

The wording here is kind of weird. Why are they using a single length to describe area? Furthermore, does "repeatedly found caesium levels above 550 kBq/m^2" mean that the entire area has that level of radioactivity or that simply they measured it in a few places and got high readings? The New Scientist article then gives high peak rates like 6400 kBq/m^2 of cesium, but fail to provide a comparison with Chernobyl. And to finish it off, they move onto talking about a totally different isotope (iodine-131). Becquerels measure the number of decay events per second, so comparing becquerel readings between two different isotopes is kind of pointless -- it doesn't compare the amount of energy being released.

Image

FBI Releases Document Confirming Roswell UFO 481

schwit1 writes "An investigator for the Air Force stated that three so-called flying saucers had been recovered in New Mexico. They were described as circular in shape with raised centers approximately 50 feet in diameter. Each one was occupied by three bodies of human shape, but only 3 feet tall dressed in metallic clothing of very fine texture."

Comment Color changing is the exception! (Score 4, Interesting) 31

There's nothing that requires a hologram to change colors as you change the viewing angle; it's just that there are many different techniques for generating holograms and the rainbow hologram happens to have been adopted widely in the commercial regime. Classic holograms were monochrome and required coherent illumination to see. The rainbow hologram is nice in that you can see it under white light, but suffers from color issues (obviously) and also only presents a three-dimensional view along one axis (try tilting your VISA card 90 degrees next time and the eagle should appear flat). I don't know if the exhibit is still there or not, but the MIT Museum in Cambridge had a really nice hologram exhibit with lots of different holograms. A bunch of them were full color and didn't have that rainbow effect.

This article does make me more curious about surface plasmons, however, since I hear that mentioned a lot nowadays and don't have a very good understanding of them.

Science

Is Science Just a Matter of Faith? 1486

Hugh Pickens writes "Pastabagel writes that the actual scientific answers to the questions of the origins of the universe, the evolution of man, and the fundamental nature of the cosmos involve things like wave equations and quantum electrodynamics and molecular biology that very few non-scientists can ever hope to understand and that if we are honest with ourselves, we must admit that we accept the incredibly complex scientific phenomena in physics, astronomy, and biology through the process of belief, not through reason. When Richard Fenyman wrote, 'I think I can safely say that nobody understands quantum mechanics,' he was including himself which is disconcerting given how many books he wrote on that very subject. The fact is that it takes years of dedicated study before scientific truth in its truest, mathematical and symbolic forms can be understood. The rest of us rely on experts to explain it, someone who has seen and understood the truth and can dumb it down for us in a language we can understand. And therein lies the big problem for science and scientists. For most people, science is really a matter of trusting the expert who tells it to us and believing what they tell us. Trust and belief. Faith. Not understanding. How can we understand science, if we can't understand the language of science? 'We don't learn science by doing science, we learn science by reading and memorizing. The same way we learn history. Do you really know what an atom is, or that a Higgs boson is a rather important thing, or did you simply accept they were what someone told you they were?'"

Comment Re:I don't buy it (Score 2) 176

Just a nitpick, but...

  • Increasing the number of megapixels while keeping everything else the same does not change the amount of light the sensor collects, although each individual pixel gets less light.
  • Increasing or decreasing the fill-factor or changing the total sensor size does.
  • In low light situations, statistics of the intensity of light should be Poisson, which means that 4 pixels at 1/4 the area, when averaged together, should result in the same amount of SNR, assuming relatively small read noise, which should be dominated by the Poisson shot noise in this situation.
  • Thus, the only downside of having just more pixels on a sensor if everything else was equal (note that fill factor of pixels would probably be different between different sensors) is that there's now a lot more bandwidth coming out of the sensor, which could be an issue with power efficiency. This could possibly be mitigated by reducing the bit depth on each individual pixel, if you assume there's going to be more noise.
  • One upside is that if the pixel size is smaller than the diffraction spot size, then the relative size of your Bayer mosaic should make demosaicing easier.
  • To summarize... if you had more pixels in the same sized sensor and can deal with the extra bandwidth, then you should be able to, in the worst case, downsample to achieve similar or higher performance compared to what you had before.

Comment Re:People get motion sick. (Score 1) 281

If I remember correctly, one of the issues with current three-dimensional displays is that there's a disparity between vergence and accomodation in the eye. That is, normally, you point your eyes inwards to look at something closer, and you focus your lens closer as well. With 3D displays, what happens is that you have to focus at a different distance (i.e. where the actual display is) than what your eyes are verging on (i.e. the apparent depth of the image)... I guess you'll get used to it when you lose accomodation in your eyes as you age... :p

Comment Why not just sell fully uncompressed audio? (Score 1) 550

You know... FLAC doesn't actually compress down from WAV all that much. Given current storage sizes, why not simply just sell fully uncompressed audio files? You can use FLAC or whatever as the transmission medium and/or storage server-side to be less of a bandwidth burden, but the user should just see an incoming WAV file, etc. that he can do whatever he wants with...

Personally, I rip all my CDs to --preset-extreme MP3 to listen, since I can just pull out my CD if I really needed a bit-perfect copy (e.g. for voice track extraction).

Moon

Chandrayaan-1 Spots Giant Underground Chamber On the Moon 322

siliconeyes writes "Scientists at the Indian Space Research Organization have discovered a giant underground chamber on the moon, which they feel could be used as a base by astronauts on future manned missions to moon. An analysis by an instrument on Chandrayaan-1 revealed a 1.7-km long and 120-metre wide cave near the moon's equator that is in the Oceanus Procellarum area of the moon that could be a suitable 'base station' for future human missions."
Linux

Un-Bricking Linux Plug Computers 68

An anonymous reader writes "Accidentally 'bricking' a little Linux plug computer doesn't have to be forever. This is a good howto on repairing a non-booting Linux plug computer. For example if it uses the uBoot environment then it already has some good built-in recovery tools. The article also mentions ESIA, the Sheevaplug installer, openocd, and GuruPlug."

Comment Re:Remember (Score 3, Informative) 199

Disclaimer: I am not very well versed in statistics and have only just read the Wikipedia article on Instrumental variables.

On page 14, the report discusses the model they use, which is a linear system of the log of the four variables they're trying to find relationships between. They then discuss 4 instrumental variables as well as two dozen or so dummy variables that describe aspects of the actual show, like when it is aired on TV, whether they have related drama CDs, net broadcasts, whether the anime was an original work or based on manga, novels, games, etc., who the target audience was and how many regions the show have been broadcast in. Table 3 has the full list, and also includes what I assume to be slopes in log-log space from their analysis as well as a "t" factor for which I'm not sure about. The four main instrumental (non-dummy) variables are: DVD price (number of thousands of yen per episode, how long a video on YouTube persists ... while the series is airing, within 1 month of that particular episode airing, and after the series is finished airing).

Table 4 is a chart highlighting that there is a negative correlation with DVD price and DVD sales, but a positive correlation of DVD price and YouTube views. There were also positive correlations between how long a video managed to stay on YouTube after airing of the TV show has been completed and DVD sales, rentals and YouTube views, but a negative correlation with Winny downloads.

According to Wikipedia, use of instrumental variables is one way to see if there is actual causation between two variables. However, I'll leave it to someone more well-versed in the subject to see if the report is accurate or not.

Slashdot Top Deals

Two can Live as Cheaply as One for Half as Long. -- Howard Kandel

Working...